Which metal imparts green color to bunsen flame?
Correct answer: D. Ba
- A. Na
- B. Ca
- C. Sr
- D. Ba
Explanation
A flame test is an analytical procedure used by chemists to detect the presence of particular metal ions, based on the color of the flame produced. When heated, the electrons in the metal ion gain energy and can jump into higher energy levels. Because this is energetically unstable, the electrons tend to fall back down to where they were before, releasing energy as they do so. This energy is released as light energy, and as these transitions vary from one metal ion to another, it leads to the characteristic colors given by each metal. A) Sodium has a golden yellow color flame. B) Calcium has a brick-red color flame. C) Strontium has a crimson-red color flame. D) Barium has a pale or grassy green color flame. Therefore, D is the correct answer.
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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